CH 17 Chemical Equilibrium Flashcards
True or False: Chemical equilibrium is a dynamic state because reactions continue to occur, but because they occur at the same rate, no net change is observed on the macroscopic level.
True: Rate of reaction (fwd) = rate of reaction (rev)
What is the equilibrium constant for the following reaction?
True or False: Only substances that appear in the expression for Q can have an effect.
True
True or False: A change in concentration will effect the value of K proportionally.
False A change in concentration has no effect on the value of K
True or False: Changes in pressure have no effect on the value of K
True
True or False: Adding an inert gas has no effect on the equilibrium position.
True: Adding an inert gas has no effect on the equilibrium position, as long as the volume does not change.
AB + heat -> A + B Reaction is endergonic so adding heat on the left side of the reaction will cause it to shift to the right to maintain equilibrium.
A + B -> AB + heat (Exothermic)
Adding heat will cause the reaction to shift to the left
van’t Hoff equation
True or False: a catalyst only increases the rate of the forward reaction.
False: A catalyst speeds up a reaction by lowering its activation energy. It therefore speeds up the forward and
reverse reactions to the same extent.
True or False: A catalyst causes a reaction to reach equilibrium more quickly, and can shift the equilibrium position proportionally.
False: A catalyst causes a reaction to reach equilibrium more quickly, but has no effect on the equilibrium position.
In a system in which n changes, reducing Volume (increasing P) will:
Relation of Gibb’s Free Energy to Keq
`
